Planned "End State" EnvironmentSource = Domain/forest will be decommissionedTarget = Previously disabled resource accounts will be enabled and used to authenticate users. Mailboxes will remain with users. Users will be provided with new machines which are members of the target domain and login with target accounts using target mailboxes.

Planned Migration Steps

1. Perform migration of AD group object using migration sessions and import files2. Perform migration of AD user objects using migration sessions and import files ensuring accounts are matched to the existing target disabled accounts. Continue to leave source accounts enabled and target disabled.* At this point users are continuing to work as is without any interruption *3. Perform AD processing of all objects leaving source account permissions in place4. Perform Exchange processing of all mailboxes leaving source account permissions in place* Again, at this point users are continuing to work as is without any interruption *5. Start migration of Batch 1 of the users (a) Enable batch 1 disabled accounts in target using Set-User -Identity 'mailbox name' -LinkedMasterAccount $null as per KB35991 (b) Provide batch 1 users with new machine in target domain (c) Batch 1 users login to new machine in target domain with target account, create Outlook profile etc6. Start migration of Batch 2 and repeat previous steps7. On completion of migration of all batches perform ADPW and EPW to remove source account and clean up

I would like to understand if my proposed timing of the ADPW and EPW processing is right and if possible is there any specific pointers around the configuration of the wizards?

Removing all and reinstalling just the AD bits is more effort then is required. just remove the Exchange bits if they are installed. The mapping data is in the AD LDS data base and stored in the project (upped more node on the left)

ADPW and EPW are part of the AD bits and license. Exchange bits are only needed if you are migrating Exchange mailboxes and PFs.

If I understand correctly we will still perform AD and EPW processing as you previously described?